{"product_id":"1785-chbm-rockwell-automation-controlnet-processor-backup","title":"1785-CHBM Rockwell Automation ControlNet Processor Backup","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe Allen-Bradley 1785-CHBM serves as an intelligent, high-availability Hot-Backup Memory Cartridge engineered exclusively for ControlNet-enabled PLC-5 programmable logic controllers. This plug-in hardware card establishes a redundant control loop between two matching processors, such as the PLC-5\/40C or PLC-5\/80C, which operate on a unified ControlNet coaxial or fiber network. Equipped with 100 Kilowords of non-volatile EEPROM backup storage, the module mirrors active control code, data registers, and bit statuses continuously between the primary controller and a designated standby unit. If the primary processor experiences a fault or unexpected shutdown, the 1785-CHBM coordinates an automatic switchover to keep downstream field operations running without disruption. We supply this redundancy cartridge as a 100% brand new, original factory component to guarantee reliable failover timing and secure electrical trace connections.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThe following technical table provides the absolute processing parameters, power consumption ratings, and physical specifications for the 1785-CHBM module:\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAllen-Bradley \/ Rockwell Automation\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCatalog Number\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1785-CHBM (Series A)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eProduct Line\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePLC-5 System (ControlNet Redundancy)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e100% Brand New Original Factory Stock\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModule Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eHot-Backup Memory Cartridge\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBackup Memory Capacity\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e100 Kilowords (100K EEPROM)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eRedundancy Switchover Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eHot-Backup (Primary to Secondary Transfer)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eTypical Switchover Time\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eLess than 1.0 second\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCompatible Processors\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1785-L40C15, 1785-L80C15 (PLC-5\/40C and PLC-5\/80C)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBus Communication Standard\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eLocal PCI 2.3 Compliant Protocol\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePrimary Network Media\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eControlNet Redundant Coaxial or Fiber Optic Cables\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBackplane Current Draw\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUp to 1.0 Amp at 5V DC (Maximum Peak Draw)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eExternal Pilot Power\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eNone Required (Draws current from 1771 slot bus)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMaximum Modules Per System\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4 Modules\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eContinuous Isolation Voltage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e50 Volts Continuous (ControlNet to Backplane Bus)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eDiagnostic Configuration\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1 Diagnostic Status Indicator Per Channel\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCircuit Board Protection\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eFactory-Applied Conformal Coating\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Ambient Temperature\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 60 degrees C (32 to 140 degrees F)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePhysical Dimensions\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e237.5 x 183 x 55 mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eNet Hardware Weight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.20 kg (0.44 lbs)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSub-Second Bumpless Failover:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe card monitors host CPU health status registers over a high-speed local PCI 2.3 compliant link. If the primary CPU drops offline, the 1785-CHBM completes a hot switchover to the secondary standby engine in less than 1 second, preserving continuous batch mixtures and turbine operations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNon-Volatile 100K Program Guarding:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAn integrated 100 Kword EEPROM chip retains your complete operational program image and critical tag databases without requiring backup battery voltage. It protects the redundancy application path through complete facility blackouts or long maintenance cycles.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCorrosive Gas Protection with Conformal Coating:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eA factory-applied conformal layer completely seals the internal electronics against moisture, dust, and corrosive ambient atmospheric gases. This robust surface layer eliminates trace short-circuits inside harsh pulp mills, water plants, and petrochemical complexes.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIntegrated 50V Galvanic Isolation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSpecialized internal isolation barriers withstand a continuous 50V potential difference between the ControlNet data pathways and the main 1771 rack logic bus. This isolation intercepts heavy electrical ground loops and high-voltage inductive surges before they can damage your CPU processors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eZero-Wiring Form Factor Installation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe compact cartridge snaps cleanly into the dedicated hardware expansion slot built into the faceplate of the ControlNet PLC-5 processor. This localized installation entirely avoids complex inter-rack synchronization cables or external terminal blocks.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan I utilize the 1785-CHBM hot-backup cartridge alongside standard DH+ processors like the 1785-L40B?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The 1785-CHBM backup cartridge works strictly with ControlNet-enabled PLC-5 processors, including the 1785-L40C15 and 1785-L80C15. Standard Data Highway Plus (DH+) processors utilize a different structural expansion slot and require different backup modules, such as the legacy 1785-CBHM cartridge.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this module require an independent external power supply during a main panel power failure?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The 1785-CHBM draws its operational 5V DC current directly through the internal pins of the primary 1771 I\/O chassis backplane. It requires no external pilot power cables, which simplifies panel layout and eliminates field wiring failures.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHow do onsite technicians verify that the redundancy monitoring channel is operating correctly?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe front faceplate contains dedicated diagnostic status LEDs that show real-time synchronization conditions per channel. A solid green light indicates successful cross-processor data mirroring, while an amber or red indication highlights a communication drop or a configuration mismatch between the primary and standby controllers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":43387222589530,"sku":"1785-CHBM","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/57._fd643011-8fed-4cc0-8a7c-3b63d9583171.jpg?v=1779071524","url":"https:\/\/www.spareoil.com\/products\/1785-chbm-rockwell-automation-controlnet-processor-backup","provider":"SpareOil Automation","version":"1.0","type":"link"}